Extraction of ammonia from gas.



PATENT Specification of Lotteroiatent.

Patented Nov. e7; sees.

s ims am August 27,1906. Serial No. 332,305.

ammonia left in the solution after distille- T (Lil whom, it may; (Home? Be it known that .i, WALT-mu Fem, cbenxtion is not lost, because it will be recovered at 1st and menu we; :1 subje oi the King the neizt or a succeedin distilling operation. of Prussia, V '1 Ernpei residing at Thenature of the car onete of mognesium 6o fionmngesson t iiilc, in the German formed by the action of the gases upon the Empire, hifV'Q ed new and useful Inn magnesium-salt gsolution depends on the provemenrs 1 so of (loses in molecular proportion in which carbonic acid the EX'lIl'ilGc mrncai il'.iorel'rom, of and ammonia are in the gases, if this pro- Which the following o specn'cssion. portion be less than one to two, basic meg- I0 This invention r ates to the extraction of nesium carbonate is formed, while if it be ammoniafrom gases containing sinmonie more than oneto two a mixture of basic carsuch, for inst-11cc, es coal-gas and the like. bonate with neutrel carbonate (or even with Hitherto such have been Washed with bicarbonate of magnesium) is formed. The water in order to obtain emmoniecsl liquor; nature of this 0 rbonetc or these carbonates 15 but in consequence of the volatile nature of does not interfere With the completeness of ammonia the resulting enunoniecsl liquor the extraction of-ammonie. has been very wool: and e considerable Theweshing process may be carried out in amount of ammonia left in the any suitable gas resher. The resulting gases to an e tent etleest corresponding to mixture of magnesium carbonate and ammo- 20 the tension or r srnnion s in solution at the nium salt being muddy, the suitable ternpemiure an? t and tile ernnro- Washer is that constructed as described in the niecel liquor has be 1 cOllillllllllP fid by sulspecification of United States Letters Psifill end other impi ice from the in out No. 829,261,.g1ented, to me August 21,

this Week .W impure amnioniscel 1906. In consequence of tile Quantity of liquor not only ees e or .sidercble loss of carbonate of magnesium the mixtureis often ammonia occur, b1" oi the impurities, so thick or stifl that the WiLSilGl end the dissuch as sulfurececl srogen, is distilled off tilling apparatus are liable to become choke'il. with the ennnonie and zip ennnonium com To avoid this, I add to the mognesimmsslt pounds produced nnourc of low' consolution before it is used for the Washing 30 centretion. or distilling a suit or salts which will rrcvcnt In order to obi in pure and. concentrated this thickening or stiffening. Suitolxe salts ammoniecsl lion. 'rom which the ammonia for this purpose are, for exam-ole, the chic can be produced by distillation in concenride, the sulfates, and similar salts of sodium, trcted and pure ondition l wuss. the gases potassium, and ammonium, and the like. It 3 5 with a so ,t o n lain, such is convenient to use c salt of the some eoirl as cl UliU, etc, or til as that of the magnesium seltused. like. in we sls example, The following is en exemple of how incool-gas or siln solution of vention' may be performed, magnesium chlolor the rid being taken as the salt ofmognesium em- 9 5 4- ployed for the absorption of ennnonie and 1m and sulammonium chlorid being taken as the salt and suli'uused to prevent the precipitate of carbonate re runznonis of magnesium from becoming too thick or the still; but it is to be understood first I do not :00 45 strengtboi xne limit myself to the use of tl1ese substances employed iens nor to the proportions given. From one msgnes'um hundred and fifty grams to tvqo bundreo and this minors o fifty grams of ma nesiuin chlorui and from" ammox um i l fifty grams to one lunilrerl and lifts grains of; r05 5 generat d, while ammonium clilorid are dissolved in one liter,

are (ii fled oil, of Witter, for exsmple; but other pro ortions and concentrates. and consequent concentration may e used, boil till all the euro lbc quantity of salts used depending on the posed, because the amount of ammonia to be absorbed. The. no 55 solution can be used gases may, for instance, contain oneznolecuthe gee-Wash ng ler proportion of carbonic acid to two and a,

the ammonia.

'certa-ined the nature of my said invention bonic acid will distil off, this containing the more ammonia the higher the temperature rises. With the distillation of the ammonia the precipitate, of magnesium carbonate diminishes", chlorid of magnesium being regenerated at the same time. Itit not necessary to boil so long that all the ammonium salt is decomposed as, the liquor can be reused for absorption even if there be left in the solution as much as twenty or more per cent. of

Aft-er being cooled to such a tem erature that no further ammonia distils oil It e liquor can be reused for absorption. The presence of the excess of ammonium salt added to the magnesium. saltin the solution will prevent the liquor from getting too thick or stiff either in the absorption apparatus or in'the distilling apparatus.

Having now particularly described and asand in what manner the same is to be performed, I declare that what i claim 1s 1. In the extraction of an'imonia from gases by treating such gases with a solution of a salt of magnesium; the addition, to the solution of the salt of magnesium, of a salt which Will prevent the precipitate of the salt of magnesium from becoming too thick, or stiil. i

2. In the extraction of aimnonia from gases by treating such with a solution of a salt oi magnesium, the addition, to the solution of the salt of magnesium, of an alkaline salt for the purpose aforesaid.

3. in the extraction' of ammonia from by treating such gases with a solution of a salt of magnesium; the addition, to the salt of nmgnesium, of a salt of ammonium, for the purpose aforesaid.

in testimony whereof I have signed thi specification in the presence of two subscribing witnesses.

WALTHER FELD W'tne'sses:

WOLDEMAR HAUPT, HENRY HASPER. 

